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Hydrogen short-long range dynamics in nANO-MgH2: A mechanical spectroscopy approach

TitoloHydrogen short-long range dynamics in nANO-MgH2: A mechanical spectroscopy approach
Tipo di pubblicazionePresentazione a Congresso
Anno di Pubblicazione2006
AutoriBonetti, E., Fiorini A.L., Pasquini L., Montone Amelia, and Antisari M.V.
Conference NameTMS Annual Meeting
Conference LocationSan Antonio, TX
ISBN Number0873396103; 9780873396103
Parole chiaveHydrides, Hydrogen, Hydrogen Diffusion, Magnesium hydride, Magnesium printing plates, Mechanical spectroscopy, Spectroscopic analysis, Storage, Storage (materials), Synthesis (chemical)
Abstract

The technological applications of MgH2 hydrides for hydrogen storage demand the overcoming of some critical issues: an improvement of the reaction kinetics and a reduction of the desorption temperature. The synthesis of nanocrystalline MgH2 by reactive milling and inert gas condensation and a proper metal catalyst addition, constitute recently employed strategies. In the investigation of the hydrogen short and long-range dynamics, sorption kinetics and nanostructure stability, the mechanical spectroscopy offers some specific advantages. In the present research this technique was employed with other experimental approaches (XRD DSC) to investigate relaxational and structural damping processes in nanocrystalline MgH2 with added catalysts (Fe). Time/temperature variation of the dynamic elasticity moduli and mechanical quality factor are correlated to hydrogen anelastic relaxation processes and concomitant structural transformation of MgH 2 to Mg associated to long range H diffusion. Results are discussed with reference to microstructural modification strategies able to assist hydrogen release.

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-33646703347&partnerID=40&md5=e90359b344ab479c539277d7856d3acd
Citation KeyBonetti2006117